diff --git a/src/Illuminate/Broadcasting/Broadcasters/AblyBroadcaster.php b/src/Illuminate/Broadcasting/Broadcasters/AblyBroadcaster.php
index 3a6db783c05c..ff05d0c19adb 100644
--- a/src/Illuminate/Broadcasting/Broadcasters/AblyBroadcaster.php
+++ b/src/Illuminate/Broadcasting/Broadcasters/AblyBroadcaster.php
@@ -216,7 +216,7 @@ protected function getPublicToken()
     /**
      * Get the private token value from the Ably key.
      *
-     * @return mixed
+     * @return string
      */
     protected function getPrivateToken()
     {